3 ms·

Can't you do that just by changing the image at the url it points to?

• cmdrfred 11y ago
  I believe gmail downloads and caches images when it receives the email now.
  • Houshalter 11y ago
    Which is even better. You can change the image right after sending it, so anyone they send it to is guaranteed to get a different image.
    • breakingcups 11y ago
      That brings up an interesting question. Does GMail cache per-user or per-url? I would suspect the latter.
      • Houshalter 11y ago
        Would still work if they sent to a different email client.